Huawei - LTE System Overview
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Transcript of Huawei - LTE System Overview
www.huawei.com
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
47pt
30pt
反白
:
FrutigerNext LT Medium
: Arial
47pt
黑体
28pt
反白
细黑体
LTE System
Overview
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page2
Objectives
Upon completion of this course, you will be able to:
Describe LTE development and features
Outline LTE network architecture
Explain LTE key technologies
Describe LTE protocol and channel
Describe LTE deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page3
Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page4
Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page5
Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page6
3G Long Term Evolution--LTE
Year 2002 20042003 2005 2006 2007 2008 2009 2010 2011 2012 or later
3G-WCDMA in
R99/R4
HSPA in R5/R6
LTE in R8
GPRS/EDGE
DL: ~384Kbps
UL: ~384Kbps
DL: ~14.4Mbps
UL: ~5.76Mbps
DL: ~42Mbps
UL: ~11Mbps
DL: ~141Mbps
UL: ~50Mbps
DL: ~144-360Kbps
UL: ~144-360Kbps
HSPA+ in R7/R8~100 ms
~70 ms
~150 ms
~45 ms
~20ms
•LTE is the next step in the evolution of 3GPP Radio Interfaces to deliver “Global
Mobile Broadband”.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page7
Drivers for LTE
There are at least three major key drivers for LTE mobile
broadband networks:
Demand for higher data-rates
increasing device capabilities, growing mobile data consumption
New spectrum allocation
Maintaining operator profitability while continued cost reduction and
competitiveness.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page8
Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page9
LTE Network Architecture E-UTRAN (Evolved Universal Terrestrial Radio Access
Network)
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page10
LTE/SAE Network Architecture - cont.
SGSN
GPRS
UMTS
E-UTRAN
cdma2000
MME
HSS PCRF
Serving GW PDN GW
BTS BSC/PCU
NodeB RNC
eNodeB
S2a
S1-U
S6a
Gx
S5/8
Gb
Iu
S1-MMES12
S3
S4S11
SGi
S9S10
User plane
Control plane
BTS
Internet
Corporate
Internet
Operator Service
Network
EPS (Evolved Packet System)
S6d
PDSNBSC
SAE
A10/A11
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page11
Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page12
LTE Operating Bands
LTE supports both FDD mode and TDD mode.
3GPP defines many bands for LTE.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page13
LTE Channel Bandwidths
LTE must support the international wireless market and
regional spectrum regulations and spectrum availability. To
this end the specifications include variable channel
bandwidths selectable from 1.4 to 20 MHz, with subcarrier
spacing of 15 kHz.
Channel bandwidth
BWChannel [MHz]1.4 3 5 10 15 20
Transmission
bandwidth
configuration NRB
6 15 25 50 75 100
NRB is the number of resource
blocks
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page14
Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page15
LTE Key Technologies
OFDMA: Orthogonal frequency division multiple access
SC-FDMA: Single carrier-frequency division multiple
access
MIMO: Multiple input multiple output
64QAM
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page16
Multiple access technology in the
downlink: OFDM and OFDMA
OFDMA is used as multiple access technology in downlink.
OFDMA is a variant of orthogonal frequency division multiplexing
(OFDM), a digital multi-carrier modulation scheme.
OFDM signal represented in frequency and time
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page17
Multiple access technology in the
downlink: OFDM and OFDMA (cont.)
OFMDA incorporates elements of time division multiple access
(TDMA).
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page18
Downlink OFDM Implementation
P/SIFFTS/Ps(t)
Add
Cyclic
Prefix
n(t)
S/PFFTP/Sr(t)
Remove
Cyclic
Prefix
Transmitter
Receiver
Channel
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page19
Downlink OFDM Implementation (cont.)
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page20
Multiple access technology in the uplink:
SC-FDMA
The high peak-to-average ratio (PAR) associated with OFDM led
3GPP to look for a different transmission scheme for the LTE
uplink.
SC-FDMA is used in uplink as multiple access technology.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page21
Comparison of OFDMA and SC-FDMA
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page22
Overview of MIMO
MIMO: Multiple Input Multiple Output
Transmitter ReceiverWireless
Channel
… …
N M
Channel Condition Feedback
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page23
What can MIMO provide?
Here is a example for 2*2 MIMO.
Transmitter ReceiverWireless Channel
Channel Condition Feedback
Data Stream 1
Data Stream 2
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page24
LTE Multiple Antenna Scheme
In downlink LTE can use 2*2 or higher order MIMO to increase
date rate.
In uplink MU-MIMO (multi-user MIMO) can be used to double
uplink capacity.
With MU-MIMO the uplink peak data rate of single user can not be
doubled.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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Page25
AMC & 64QAM
AMC, Adaptive Modulation and Coding
the radio-link data rate is controlled by adjusting the
modulation scheme and/or the channel coding rate
DL/UL modulations: QPSK, 16QAM, and 64QAM
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page26
Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page27
Contents
3. LTE Protocol Stacks and Channels
3.1 LTE Protocol Stacks
3.2 LTE Channels
3.3 LTE Radio Frame
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page28
Functional Split between E-UTRAN and
EPC
internet
eNB
RB Control
Connection Mobility Cont.
eNB Measurement
Configuration & Provision
Dynamic Resource
Allocation (Scheduler)
PDCP
PHY
MME
S-GW
S1
MAC
Inter Cell RRM
Radio Admission Control
RLC
E-UTRAN EPC
RRC
Mobility
Anchoring
EPS Bearer Control
Idle State Mobility
Handling
NAS Security
P-GW
UE IP address
allocation
Packet Filtering
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page30
Radio Interface Protocol Architecture
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page31
eNB
PHY
UE
PHY
MAC
RLC
MAC
PDCPPDCP
RLC
eNB
PHY
UE
PHY
MAC
RLC
MAC
MME
RLC
NAS NAS
RRC RRC
PDCP PDCP
User-plane protocol stack Control-plane protocol stack
Radio Interface Protocol Architecture (cont.)
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page32
LTE Physical Channel
DL
Physical Broadcast Channel (PBCH)
Physical Control Format Indicator Channel (PCFICH)
Physical Downlink Control Channel (PDCCH)
Physical Hybrid ARQ Indicator Channel (PHICH)
Physical Downlink Shared Channel (PDSCH)
Physical Multicast Channel (PMCH)
UL
Physical Uplink Control Channel (PUCCH)
Physical Uplink Shared Channel (PUSCH)
Physical Random Access Channel (PRACH)
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page33
LTE Transport Channel
Physical layer transport channels offer information transfer to medium
access control (MAC) and higher layers
DL
Broadcast Channel (BCH)
Downlink Shared Channel (DL-SCH)
Paging Channel (PCH)
Multicast Channel (MCH)
UL
Uplink Shared Channel (UL-SCH)
Random Access Channel (RACH)
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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Page35
LTE Logical Channel
Logical channels are offered by the MAC layer
Control Channels: Control-plane information
Broadcast Control Channel (BCCH)
Paging Control Channel (PCCH)
Dedicated Control Channel (DCCH)
Multicast Control Channel (MCCH Dedicated Control Channel)
Common Control Channel (CCCH)
Traffic Channels: User-plane information
Dedicated Traffic Channel (DTCH): transmission of all uplink and non-
MBMS downlink user data
Multicast Traffic Channel (MTCH): transmission of MBMS services
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page36
Channel Mappings
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page37
Frame Structure FDD frame structure
TDD frame structure
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page38
Resource Grid
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page39
Bandwidth Configuration
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page40
Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page41
LTE SAE
LTE Network Composition
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Page42
LTE Network Transport
eNB
SAE GW
/PDN GW
FE/GE
IP/Ethernet
Network
FE/GE
• 100/1000Base-T, RJ45• 100Base-FX/1000Base-X, SM or MM Fiber, SFP-based connector
eNB eNB
eNB
FE/GE FE/GE
FE/GE
eNBLegacy
2G/3G
FE/GE
IP
MAC
PHY
eNB Daisy-chaining with integrated IP switching
Co-transmission with legacy 2G/3G
FE/GE o/e
FE/GE
RNC/BSC
eN
B
FE/GE
BTS/Node B
Co-transmission for Multi-mode base station
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page43
eNodeB 3900 Series
Modularization
RRU/RFU
BBU
eNB
uniNodeB
1
2
3 Platform
GSM/TD-SCDMA/WCDMA/CDMA/LTE Unified All-IP Base Station Architecture
Modularization
Using BBU plus RRU and RFU leads to a flexible configuration for Distributed and
Macro.
Multimode
Modularization Supports Different Modes
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
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) :18pt
Page44
Smooth evolution to LTE
Investment protection while evolving from GSM/UMTS to LTE
Radio units for GSM/UMTS and LTE are inter-changeable in the same frequency band
Baseband boards in multi-mode BBU are inter-changeable between GSM/UMTS and LTE
LTE Card
LTE (100M/50M)
Same band Different band
Same band Different band
GSM/HSPA(+)/LTE RRU LTE RRU
GSM/HSPA(+)/LTE RFU LTE RFU
LTE Card
GSM / UMTS / HSPA(14.4M/5.76M) /
HSPA+(28M/11.5M)
BBU
RRU
Cabinet-based Node B
BBU
Software upgrade
Software upgrade
Adding LTE RRU
Adding LTE RFU BBU
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page45
Flexible evolution for Cabinet NodeB
G
S
M
G
S
M
G
S
M
GSM&UMTS operator
UMTS roll out will
reduce GSM
expansion
investment at
hot spot
Operator issue New business ALL IP service
GSM for Voice
HSPA/LTE for Data network
GSM
update/rollout
G
S
M
G
S
M
G
S
M
G
S
M
G
S
M
G
S
M
UMTS/HSPA
rollout
U+H
U+H
U+H
UMTS/HSPA + GSM
U+H
U+H
U+H
U+H
U+H
U+H
L
T
E
L
T
E
L
T
E
UMTS/HSPA + LTEconvergence
GSM + LTE Data
network convergence
G
S
M
G
S
M
G
S
M
L
T
E
L
T
E
L
T
E
L
T
E
L
T
E
L
T
E
L
T
E
L
T
E
L
T
E
LTE
UMTS<E operator
LTE for high speed
mobile broadband
Reuse GSM frequency resource for LTE
LTE for mobile broadband
Operator issue New business ALL IP service
G
S
M
G
S
M
G
S
M
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page46
Summary
Standardization in the form of 3GPP Release 8
Support for both FDD and TDD.
Flexible spectrum allocation (1.4 ~ 20 MHz).
IP-based flat network architecture
Multicarrier-based radio air interface
OFDMA and SC-FDMA
Multi-input multi-output (MIMO)
Adaptive modulation and coding
DL modulations: QPSK, 16QAM, and 64QAM
UL modulations: QPSK, 16QAM, and 64QAM
ARQ within RLC sublayer and Hybrid ARQ within MAC sublayer
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
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) :18pt
Page47
LTE Standard Specifications
Freely downloadable from
http://www.3gpp.org/ftp/Specs/archive/36_series/
Thank youwww.huawei.com